Hi LattePanda community!
I have made an application to control up to 8 relays, It also has the voice synthesizer.
Using Visual Studio 2017 (C# .NET) and a modfied LattePanda.CustomFirmata library.LP_Relay Controller_UI

LattePanda Relay Controller UI (Image)

DExnDFoXUAAGctQ.jpg (148.87 KiB) Viewed 8165 times

You can change the Pin and the text of each Relay. The configuration and status of each relay will be saved when you close the program. Also the voice settings.

This program uses the LattePanda.Firmata library to control the Arduino. It connects by default to 57600 baud.
The speed of response in the relay is instantaneous even using the voice synthesizer, the synthesizer uses a new thread.

To publish my App to Windows Store I need to register as an App Developer, and pay for publish if your Apps are Free with no Ads or not.

This is the last email I've received from microsoft:

Dear Luis,

Thank you for your interest in using Desktop Bridge to bring your app or game to the Windows Store. Now that you’ve submitted your information to our team, we’d like to give you a quick rundown on the process:

Our team will be doing the following:

Step 1: Review the information you've submitted and reach out to you if we have any questions.
Step 2: Verify your app or game's compatibility with the Desktop Bridge and work with you to address any concerns.
Step 3: Enable your Dev Center account with the correct permissions and assist in getting your app or game published to the Windows Store.
Your next step is to register on the Dev Center to create your publisher account.

Stay tuned for further updates from the Desktop Bridge team. We'll be in touch soon.